Mathematics Crossword

12345678
Across
  1. 2. which natural number has no predecessor
  2. 3. what is the inverse of division
  3. 6. the successor of two digit number
  4. 7. the smallest whole number is
  5. 8. 52-[3+{4+4(6+4)}] solve the bracket
Down
  1. 1. the successor of 599 is
  2. 2. the multiplicative identity for whole numbers is
  3. 4. 1,2,3,4,6,12 are factors of
  4. 5. 1,2,4,5,10,20 are the factors of